only takes up 3/4 of screen

I just received my new laptop.....Alienware18 -- it was a present, so no comments on spending too much money.

Loaded Crossfire

The screen does not fill with crossfire and yes I have marked it full screen, even tried the windows one and that made it about 1/4 of the screen.

I am not a techie so have no clue what to do.....am running dual Nvidia cards SLI

Please someone help me.

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